Respect human lives , Seek help from authorities when faced with injustice/wrong-doing etc.. .

This hadith, narrated by Abdullah bin Umar, warns us against the consequences of unlawful killing. It is a grave sin to take someone's life without any valid reason or permission from the authorities. Such an act will have dire consequences for the perpetrator and there will be no escape from it. Islam teaches us to respect human life and forbids us to take it away without any valid reason or permission. We should always remember that Allah is watching over us and He knows our intentions and deeds, so we should strive to do good deeds only in order to please Him.

Furthermore, this hadith also serves as a reminder that we should not take matters into our own hands when faced with injustice or wrong-doing; instead we should seek help from those who are authorized by law to deal with such matters in a just manner. We must also remember that Allah is Just and He will reward those who do good deeds while punishing those who commit sins according to His laws and justice system.